rick santorum is stumping in tennessee where polls show he is ahead of romney. ron paul and newt gingrich are looking at super tuesday as an opportunity to get back in the race. >>> north korea has agreed to suspend uranium enrichment and long-range nuclear weapons testing in exchange for badly needed food and aid from the united states. today's announcement could lead to more talks to convince north korea to give up its nuclear program. >>> a lesson in giving and giving thanks. nearly one year after the tsunami and earthquake in japan destroyed thousands of lives, a group of survivors has come to the bay area on a very special mission. zack heene on the young students who inspired a community. >>> reporter: it's not just a lesson in japanese but a lesson in global giving. this second grade class at rosa park elementary got to meet five japanese college students from one of the areas hardest hit from last year's tsunami. [ non-english language ] >> thank you very much for your help and she says she's so happy. >> reporter: happy and showing appreciation for the